1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <unistd.h>
35 #include <zlib.h>
36 #include <time.h>
37 
38 #include "got_object.h"
39 #include "got_error.h"
40 #include "got_path.h"
41 #include "got_repository.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
50 
51 #ifndef MIN
52 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
53 #endif
54 
55 #ifndef nitems
56 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
57 #endif
58 
59 static const struct got_error *
60 poll_fd(int fd, int events, int timeout)
61 {
62 	struct pollfd pfd[1];
63 	struct timespec ts;
64 	sigset_t sigset;
65 	int n;
66 
67 	pfd[0].fd = fd;
68 	pfd[0].events = events;
69 
70 	ts.tv_sec = timeout;
71 	ts.tv_nsec = 0;
72 
73 	if (sigemptyset(&sigset) == -1)
74 		return got_error_from_errno("sigemptyset");
75 	if (sigaddset(&sigset, SIGWINCH) == -1)
76 		return got_error_from_errno("sigaddset");
77 
78 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
79 	if (n == -1)
80 		return got_error_from_errno("ppoll");
81 	if (n == 0)
82 		return got_error(GOT_ERR_TIMEOUT);
83 	if (pfd[0].revents & (POLLERR | POLLNVAL))
84 		return got_error_from_errno("poll error");
85 	if (pfd[0].revents & (events | POLLHUP))
86 		return NULL;
87 
88 	return got_error(GOT_ERR_INTERRUPT);
89 }
90 
91 static const struct got_error *
92 read_imsg(struct imsgbuf *ibuf)
93 {
94 	const struct got_error *err;
95 	size_t n;
96 
97 	/*
98 	 * There is no imsg API function to tell us whether the
99 	 * read buffer still contains pending data :-(
100 	 */
101 	if (ibuf->r.wpos < IMSG_HEADER_SIZE) {
102 		err = poll_fd(ibuf->fd, POLLIN, INFTIM);
103 		if (err)
104 			return err;
105 	}
106 
107 	n = imsg_read(ibuf);
108 	if (n == -1) {
109 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
110 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
111 		return got_error(GOT_ERR_PRIVSEP_READ);
112 	}
113 	if (n == 0)
114 		return got_error(GOT_ERR_PRIVSEP_PIPE);
115 
116 	return NULL;
117 }
118 
119 const struct got_error *
120 got_privsep_wait_for_child(pid_t pid)
121 {
122 	int child_status;
123 
124 	if (waitpid(pid, &child_status, 0) == -1)
125 		return got_error_from_errno("waitpid");
126 
127 	if (!WIFEXITED(child_status))
128 		return got_error(GOT_ERR_PRIVSEP_DIED);
129 
130 	if (WEXITSTATUS(child_status) != 0)
131 		return got_error(GOT_ERR_PRIVSEP_EXIT);
132 
133 	return NULL;
134 }
135 
136 static const struct got_error *
137 recv_imsg_error(struct imsg *imsg, size_t datalen)
138 {
139 	struct got_imsg_error *ierr;
140 
141 	if (datalen != sizeof(*ierr))
142 		return got_error(GOT_ERR_PRIVSEP_LEN);
143 
144 	ierr = imsg->data;
145 	if (ierr->code == GOT_ERR_ERRNO) {
146 		static struct got_error serr;
147 		serr.code = GOT_ERR_ERRNO;
148 		serr.msg = strerror(ierr->errno_code);
149 		return &serr;
150 	}
151 
152 	return got_error(ierr->code);
153 }
154 
155 const struct got_error *
156 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
157     size_t min_datalen)
158 {
159 	const struct got_error *err;
160 	ssize_t n;
161 
162 	n = imsg_get(ibuf, imsg);
163 	if (n == -1)
164 		return got_error_from_errno("imsg_get");
165 
166 	while (n == 0) {
167 		err = read_imsg(ibuf);
168 		if (err)
169 			return err;
170 		n = imsg_get(ibuf, imsg);
171 		if (n == -1)
172 			return got_error_from_errno("imsg_get");
173 	}
174 
175 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
176 		return got_error(GOT_ERR_PRIVSEP_LEN);
177 
178 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
179 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
180 		return recv_imsg_error(imsg, datalen);
181 	}
182 
183 	return NULL;
184 }
185 
186 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
187 void
188 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
189 {
190 	const struct got_error *poll_err;
191 	struct got_imsg_error ierr;
192 	int ret;
193 
194 	ierr.code = err->code;
195 	if (err->code == GOT_ERR_ERRNO)
196 		ierr.errno_code = errno;
197 	else
198 		ierr.errno_code = 0;
199 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
200 	if (ret == -1) {
201 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
202 		    getprogname(), err->code, err->msg, strerror(errno));
203 		return;
204 	}
205 
206 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
207 	if (poll_err) {
208 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
209 		    getprogname(), err->code, err->msg, poll_err->msg);
210 		return;
211 	}
212 
213 	ret = imsg_flush(ibuf);
214 	if (ret == -1) {
215 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
216 		    getprogname(), err->code, err->msg, strerror(errno));
217 		imsg_clear(ibuf);
218 		return;
219 	}
220 }
221 
222 static const struct got_error *
223 flush_imsg(struct imsgbuf *ibuf)
224 {
225 	const struct got_error *err;
226 
227 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
228 	if (err)
229 		return err;
230 
231 	if (imsg_flush(ibuf) == -1) {
232 		imsg_clear(ibuf);
233 		return got_error_from_errno("imsg_flush");
234 	}
235 
236 	return NULL;
237 }
238 
239 const struct got_error *
240 got_privsep_flush_imsg(struct imsgbuf *ibuf)
241 {
242 	return flush_imsg(ibuf);
243 }
244 
245 const struct got_error *
246 got_privsep_send_stop(int fd)
247 {
248 	const struct got_error *err = NULL;
249 	struct imsgbuf ibuf;
250 
251 	imsg_init(&ibuf, fd);
252 
253 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
254 		return got_error_from_errno("imsg_compose STOP");
255 
256 	err = flush_imsg(&ibuf);
257 	return err;
258 }
259 
260 const struct got_error *
261 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
262     struct got_object_id *id)
263 {
264 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
265 	    id, sizeof(*id)) == -1)
266 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
267 
268 	return flush_imsg(ibuf);
269 }
270 
271 const struct got_error *
272 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
273     struct got_object_id *id)
274 {
275 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
276 	    id, sizeof(*id)) == -1)
277 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
278 
279 	return flush_imsg(ibuf);
280 }
281 
282 const struct got_error *
283 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
284 {
285 	const struct got_error *err = NULL;
286 
287 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
288 	    == -1) {
289 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
290 		close(outfd);
291 		return err;
292 	}
293 
294 	return flush_imsg(ibuf);
295 }
296 
297 const struct got_error *
298 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
299     uint8_t *data)
300 {
301 	const struct got_error *err = NULL;
302 	struct got_imsg_raw_obj iobj;
303 	size_t len = sizeof(iobj);
304 	struct ibuf *wbuf;
305 
306 	iobj.hdrlen = hdrlen;
307 	iobj.size = size;
308 
309 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
310 		len += (size_t)size + hdrlen;
311 
312 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
313 	if (wbuf == NULL) {
314 		err = got_error_from_errno("imsg_create RAW_OBJECT");
315 		return err;
316 	}
317 
318 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
319 		return got_error_from_errno("imsg_add RAW_OBJECT");
320 
321 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
322 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
323 			return got_error_from_errno("imsg_add RAW_OBJECT");
324 	}
325 
326 	wbuf->fd = -1;
327 	imsg_close(ibuf, wbuf);
328 
329 	return flush_imsg(ibuf);
330 }
331 
332 const struct got_error *
333 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
334     struct imsgbuf *ibuf)
335 {
336 	const struct got_error *err = NULL;
337 	struct imsg imsg;
338 	struct got_imsg_raw_obj *iobj;
339 	size_t datalen;
340 
341 	*outbuf = NULL;
342 
343 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
344 	if (err)
345 		return err;
346 
347 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
348 
349 	switch (imsg.hdr.type) {
350 	case GOT_IMSG_RAW_OBJECT:
351 		if (datalen < sizeof(*iobj)) {
352 			err = got_error(GOT_ERR_PRIVSEP_LEN);
353 			break;
354 		}
355 		iobj = imsg.data;
356 		*size = iobj->size;
357 		*hdrlen = iobj->hdrlen;
358 
359 		if (datalen == sizeof(*iobj)) {
360 			/* Data has been written to file descriptor. */
361 			break;
362 		}
363 
364 		if (*size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
365 			err = got_error(GOT_ERR_PRIVSEP_LEN);
366 			break;
367 		}
368 
369 		*outbuf = malloc(*size + *hdrlen);
370 		if (*outbuf == NULL) {
371 			err = got_error_from_errno("malloc");
372 			break;
373 		}
374 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
375 		break;
376 	default:
377 		err = got_error(GOT_ERR_PRIVSEP_MSG);
378 		break;
379 	}
380 
381 	imsg_free(&imsg);
382 
383 	return err;
384 }
385 
386 const struct got_error *
387 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
388     struct got_object_id *id, int pack_idx)
389 {
390 	const struct got_error *err = NULL;
391 	struct got_imsg_packed_object iobj;
392 	void *data;
393 	size_t len;
394 
395 	if (pack_idx != -1) { /* commit is packed */
396 		iobj.idx = pack_idx;
397 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
398 		data = &iobj;
399 		len = sizeof(iobj);
400 	} else {
401 		data = id;
402 		len = sizeof(*id);
403 	}
404 
405 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
406 	    == -1) {
407 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
408 		close(fd);
409 		return err;
410 	}
411 
412 	return flush_imsg(ibuf);
413 }
414 
415 const struct got_error *
416 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
417     struct got_object_id *id, int pack_idx)
418 {
419 	struct ibuf *wbuf;
420 	size_t len;
421 
422 	if (pack_idx != -1)
423 		len = sizeof(struct got_imsg_packed_object);
424 	else
425 		len = sizeof(*id);
426 
427 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
428 	if (wbuf == NULL)
429 		return got_error_from_errno("imsg_create TREE_REQUEST");
430 
431 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
432 		return got_error_from_errno("imsg_add TREE_REQUEST");
433 
434 	if (pack_idx != -1) { /* tree is packed */
435 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
436 			return got_error_from_errno("imsg_add TREE_REQUEST");
437 	}
438 
439 	wbuf->fd = fd;
440 	imsg_close(ibuf, wbuf);
441 
442 	return flush_imsg(ibuf);
443 }
444 
445 const struct got_error *
446 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
447     struct got_object_id *id, int pack_idx)
448 {
449 	struct got_imsg_packed_object iobj;
450 	void *data;
451 	size_t len;
452 
453 	if (pack_idx != -1) { /* tag is packed */
454 		iobj.idx = pack_idx;
455 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
456 		data = &iobj;
457 		len = sizeof(iobj);
458 	} else {
459 		data = id;
460 		len = sizeof(*id);
461 	}
462 
463 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
464 	    == -1)
465 		return got_error_from_errno("imsg_compose TAG_REQUEST");
466 
467 	return flush_imsg(ibuf);
468 }
469 
470 const struct got_error *
471 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
472     struct got_object_id *id, int pack_idx)
473 {
474 	const struct got_error *err = NULL;
475 	struct got_imsg_packed_object iobj;
476 	void *data;
477 	size_t len;
478 
479 	if (pack_idx != -1) { /* blob is packed */
480 		iobj.idx = pack_idx;
481 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
482 		data = &iobj;
483 		len = sizeof(iobj);
484 	} else {
485 		data = id;
486 		len = sizeof(*id);
487 	}
488 
489 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
490 	    == -1) {
491 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
492 		close(infd);
493 		return err;
494 	}
495 
496 	return flush_imsg(ibuf);
497 }
498 
499 const struct got_error *
500 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
501 {
502 	const struct got_error *err = NULL;
503 
504 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
505 	    == -1) {
506 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
507 		close(outfd);
508 		return err;
509 	}
510 
511 	return flush_imsg(ibuf);
512 }
513 
514 static const struct got_error *
515 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
516 {
517 	const struct got_error *err = NULL;
518 
519 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
520 		err = got_error_from_errno("imsg_compose TMPFD");
521 		close(fd);
522 		return err;
523 	}
524 
525 	return flush_imsg(ibuf);
526 }
527 
528 const struct got_error *
529 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
530 {
531 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
532 }
533 
534 const struct got_error *
535 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
536 {
537 	struct got_imsg_object iobj;
538 
539 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
540 	iobj.type = obj->type;
541 	iobj.flags = obj->flags;
542 	iobj.hdrlen = obj->hdrlen;
543 	iobj.size = obj->size;
544 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
545 		iobj.pack_offset = obj->pack_offset;
546 		iobj.pack_idx = obj->pack_idx;
547 	}
548 
549 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
550 	    == -1)
551 		return got_error_from_errno("imsg_compose OBJECT");
552 
553 	return flush_imsg(ibuf);
554 }
555 
556 const struct got_error *
557 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
558     struct got_pathlist_head *have_refs, int fetch_all_branches,
559     struct got_pathlist_head *wanted_branches,
560     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
561 {
562 	const struct got_error *err = NULL;
563 	struct ibuf *wbuf;
564 	size_t len;
565 	struct got_pathlist_entry *pe;
566 	struct got_imsg_fetch_request fetchreq;
567 
568 	memset(&fetchreq, 0, sizeof(fetchreq));
569 	fetchreq.fetch_all_branches = fetch_all_branches;
570 	fetchreq.list_refs_only = list_refs_only;
571 	fetchreq.verbosity = verbosity;
572 	TAILQ_FOREACH(pe, have_refs, entry)
573 		fetchreq.n_have_refs++;
574 	TAILQ_FOREACH(pe, wanted_branches, entry)
575 		fetchreq.n_wanted_branches++;
576 	TAILQ_FOREACH(pe, wanted_refs, entry)
577 		fetchreq.n_wanted_refs++;
578 	len = sizeof(struct got_imsg_fetch_request);
579 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
580 		close(fd);
581 		return got_error(GOT_ERR_NO_SPACE);
582 	}
583 
584 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
585 	    &fetchreq, sizeof(fetchreq)) == -1)
586 		return got_error_from_errno(
587 		    "imsg_compose FETCH_SERVER_PROGRESS");
588 
589 	err = flush_imsg(ibuf);
590 	if (err) {
591 		close(fd);
592 		return err;
593 	}
594 	fd = -1;
595 
596 	TAILQ_FOREACH(pe, have_refs, entry) {
597 		const char *name = pe->path;
598 		size_t name_len = pe->path_len;
599 		struct got_object_id *id = pe->data;
600 
601 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
602 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
603 		if (wbuf == NULL)
604 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
605 
606 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
607 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
608 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
609 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
610 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
611 		if (imsg_add(wbuf, name, name_len) == -1)
612 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
613 
614 		wbuf->fd = -1;
615 		imsg_close(ibuf, wbuf);
616 		err = flush_imsg(ibuf);
617 		if (err)
618 			return err;
619 	}
620 
621 	TAILQ_FOREACH(pe, wanted_branches, entry) {
622 		const char *name = pe->path;
623 		size_t name_len = pe->path_len;
624 
625 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
626 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
627 		    len);
628 		if (wbuf == NULL)
629 			return got_error_from_errno(
630 			    "imsg_create FETCH_WANTED_BRANCH");
631 
632 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
633 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
634 			return got_error_from_errno(
635 			    "imsg_add FETCH_WANTED_BRANCH");
636 		if (imsg_add(wbuf, name, name_len) == -1)
637 			return got_error_from_errno(
638 			    "imsg_add FETCH_WANTED_BRANCH");
639 
640 		wbuf->fd = -1;
641 		imsg_close(ibuf, wbuf);
642 		err = flush_imsg(ibuf);
643 		if (err)
644 			return err;
645 	}
646 
647 	TAILQ_FOREACH(pe, wanted_refs, entry) {
648 		const char *name = pe->path;
649 		size_t name_len = pe->path_len;
650 
651 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
652 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
653 		    len);
654 		if (wbuf == NULL)
655 			return got_error_from_errno(
656 			    "imsg_create FETCH_WANTED_REF");
657 
658 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
659 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
660 			return got_error_from_errno(
661 			    "imsg_add FETCH_WANTED_REF");
662 		if (imsg_add(wbuf, name, name_len) == -1)
663 			return got_error_from_errno(
664 			    "imsg_add FETCH_WANTED_REF");
665 
666 		wbuf->fd = -1;
667 		imsg_close(ibuf, wbuf);
668 		err = flush_imsg(ibuf);
669 		if (err)
670 			return err;
671 	}
672 
673 
674 	return NULL;
675 
676 }
677 
678 const struct got_error *
679 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
680 {
681 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
682 }
683 
684 const struct got_error *
685 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
686     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
687     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
688 {
689 	const struct got_error *err = NULL;
690 	struct imsg imsg;
691 	size_t datalen;
692 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
693 	size_t n, remain;
694 	off_t off;
695 	int i;
696 
697 	*done = 0;
698 	*id = NULL;
699 	*refname = NULL;
700 	*server_progress = NULL;
701 	*packfile_size = 0;
702 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
703 
704 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
705 	if (err)
706 		return err;
707 
708 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
709 	switch (imsg.hdr.type) {
710 	case GOT_IMSG_ERROR:
711 		if (datalen < sizeof(struct got_imsg_error)) {
712 			err = got_error(GOT_ERR_PRIVSEP_LEN);
713 			break;
714 		}
715 		err = recv_imsg_error(&imsg, datalen);
716 		break;
717 	case GOT_IMSG_FETCH_SYMREFS:
718 		if (datalen < sizeof(*isymrefs)) {
719 			err = got_error(GOT_ERR_PRIVSEP_LEN);
720 			break;
721 		}
722 		if (isymrefs != NULL) {
723 			err = got_error(GOT_ERR_PRIVSEP_MSG);
724 			break;
725 		}
726 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
727 		off = sizeof(*isymrefs);
728 		remain = datalen - off;
729 		for (n = 0; n < isymrefs->nsymrefs; n++) {
730 			struct got_imsg_fetch_symref *s;
731 			char *name, *target;
732 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
733 				err = got_error(GOT_ERR_PRIVSEP_LEN);
734 				goto done;
735 			}
736 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
737 			off += sizeof(*s);
738 			remain -= sizeof(*s);
739 			if (remain < s->name_len) {
740 				err = got_error(GOT_ERR_PRIVSEP_LEN);
741 				goto done;
742 			}
743 			name = strndup(imsg.data + off, s->name_len);
744 			if (name == NULL) {
745 				err = got_error_from_errno("strndup");
746 				goto done;
747 			}
748 			off += s->name_len;
749 			remain -= s->name_len;
750 			if (remain < s->target_len) {
751 				err = got_error(GOT_ERR_PRIVSEP_LEN);
752 				free(name);
753 				goto done;
754 			}
755 			target = strndup(imsg.data + off, s->target_len);
756 			if (target == NULL) {
757 				err = got_error_from_errno("strndup");
758 				free(name);
759 				goto done;
760 			}
761 			off += s->target_len;
762 			remain -= s->target_len;
763 			err = got_pathlist_append(symrefs, name, target);
764 			if (err) {
765 				free(name);
766 				free(target);
767 				goto done;
768 			}
769 		}
770 		break;
771 	case GOT_IMSG_FETCH_REF:
772 		if (datalen <= SHA1_DIGEST_LENGTH) {
773 			err = got_error(GOT_ERR_PRIVSEP_MSG);
774 			break;
775 		}
776 		*id = malloc(sizeof(**id));
777 		if (*id == NULL) {
778 			err = got_error_from_errno("malloc");
779 			break;
780 		}
781 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
782 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
783 		    datalen - SHA1_DIGEST_LENGTH);
784 		if (*refname == NULL) {
785 			err = got_error_from_errno("strndup");
786 			break;
787 		}
788 		break;
789 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
790 		if (datalen == 0) {
791 			err = got_error(GOT_ERR_PRIVSEP_LEN);
792 			break;
793 		}
794 		*server_progress = strndup(imsg.data, datalen);
795 		if (*server_progress == NULL) {
796 			err = got_error_from_errno("strndup");
797 			break;
798 		}
799 		for (i = 0; i < datalen; i++) {
800 			if (!isprint((unsigned char)(*server_progress)[i]) &&
801 			    !isspace((unsigned char)(*server_progress)[i])) {
802 				err = got_error(GOT_ERR_PRIVSEP_MSG);
803 				free(*server_progress);
804 				*server_progress = NULL;
805 				goto done;
806 			}
807 		}
808 		break;
809 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
810 		if (datalen < sizeof(*packfile_size)) {
811 			err = got_error(GOT_ERR_PRIVSEP_MSG);
812 			break;
813 		}
814 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
815 		break;
816 	case GOT_IMSG_FETCH_DONE:
817 		if (datalen != SHA1_DIGEST_LENGTH) {
818 			err = got_error(GOT_ERR_PRIVSEP_MSG);
819 			break;
820 		}
821 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
822 		*done = 1;
823 		break;
824 	default:
825 		err = got_error(GOT_ERR_PRIVSEP_MSG);
826 		break;
827 	}
828 done:
829 	if (err) {
830 		free(*id);
831 		*id = NULL;
832 		free(*refname);
833 		*refname = NULL;
834 	}
835 	imsg_free(&imsg);
836 	return err;
837 }
838 
839 static const struct got_error *
840 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
841     int delete, struct imsgbuf *ibuf)
842 {
843 	size_t len;
844 	struct ibuf *wbuf;
845 
846 	len = sizeof(struct got_imsg_send_ref) + name_len;
847 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
848 	if (wbuf == NULL)
849 		return got_error_from_errno("imsg_create SEND_REF");
850 
851 	/* Keep in sync with struct got_imsg_send_ref! */
852 	if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
853 		return got_error_from_errno("imsg_add SEND_REF");
854 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
855 		return got_error_from_errno("imsg_add SEND_REF");
856 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
857 		return got_error_from_errno("imsg_add SEND_REF");
858 	if (imsg_add(wbuf, name, name_len) == -1)
859 		return got_error_from_errno("imsg_add SEND_REF");
860 
861 	wbuf->fd = -1;
862 	imsg_close(ibuf, wbuf);
863 	return flush_imsg(ibuf);
864 }
865 
866 const struct got_error *
867 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
868     struct got_pathlist_head *have_refs,
869     struct got_pathlist_head *delete_refs,
870     int verbosity)
871 {
872 	const struct got_error *err = NULL;
873 	struct got_pathlist_entry *pe;
874 	struct got_imsg_send_request sendreq;
875 	struct got_object_id zero_id;
876 
877 	memset(&zero_id, 0, sizeof(zero_id));
878 	memset(&sendreq, 0, sizeof(sendreq));
879 	sendreq.verbosity = verbosity;
880 	TAILQ_FOREACH(pe, have_refs, entry)
881 		sendreq.nrefs++;
882 	TAILQ_FOREACH(pe, delete_refs, entry)
883 		sendreq.nrefs++;
884 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
885 	    &sendreq, sizeof(sendreq)) == -1) {
886 		err = got_error_from_errno(
887 		    "imsg_compose FETCH_SERVER_PROGRESS");
888 		goto done;
889 	}
890 
891 	err = flush_imsg(ibuf);
892 	if (err)
893 		goto done;
894 	fd = -1;
895 
896 	TAILQ_FOREACH(pe, have_refs, entry) {
897 		const char *name = pe->path;
898 		size_t name_len = pe->path_len;
899 		struct got_object_id *id = pe->data;
900 		err = send_send_ref(name, name_len, id, 0, ibuf);
901 		if (err)
902 			goto done;
903 	}
904 
905 	TAILQ_FOREACH(pe, delete_refs, entry) {
906 		const char *name = pe->path;
907 		size_t name_len = pe->path_len;
908 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
909 		if (err)
910 			goto done;
911 	}
912 done:
913 	if (fd != -1 && close(fd) == -1 && err == NULL)
914 		err = got_error_from_errno("close");
915 	return err;
916 
917 }
918 
919 const struct got_error *
920 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
921     struct imsgbuf *ibuf)
922 {
923 	const struct got_error *err = NULL;
924 	struct imsg imsg;
925 	size_t datalen;
926 	int done = 0;
927 	struct got_imsg_send_remote_ref iremote_ref;
928 	struct got_object_id *id = NULL;
929 	char *refname = NULL;
930 	struct got_pathlist_entry *new;
931 
932 	while (!done) {
933 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
934 		if (err)
935 			return err;
936 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
937 		switch (imsg.hdr.type) {
938 		case GOT_IMSG_ERROR:
939 			if (datalen < sizeof(struct got_imsg_error)) {
940 				err = got_error(GOT_ERR_PRIVSEP_LEN);
941 				goto done;
942 			}
943 			err = recv_imsg_error(&imsg, datalen);
944 			goto done;
945 		case GOT_IMSG_SEND_REMOTE_REF:
946 			if (datalen < sizeof(iremote_ref)) {
947 				err = got_error(GOT_ERR_PRIVSEP_MSG);
948 				goto done;
949 			}
950 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
951 			if (datalen != sizeof(iremote_ref) +
952 			    iremote_ref.name_len) {
953 				err = got_error(GOT_ERR_PRIVSEP_MSG);
954 				goto done;
955 			}
956 			id = malloc(sizeof(*id));
957 			if (id == NULL) {
958 				err = got_error_from_errno("malloc");
959 				goto done;
960 			}
961 			memcpy(id->sha1, iremote_ref.id, SHA1_DIGEST_LENGTH);
962 			refname = strndup(imsg.data + sizeof(iremote_ref),
963 			    datalen - sizeof(iremote_ref));
964 			if (refname == NULL) {
965 				err = got_error_from_errno("strndup");
966 				goto done;
967 			}
968 			err = got_pathlist_insert(&new, remote_refs,
969 			    refname, id);
970 			if (err)
971 				goto done;
972 			if (new == NULL) { /* duplicate which wasn't inserted */
973 				free(id);
974 				free(refname);
975 			}
976 			id = NULL;
977 			refname = NULL;
978 			break;
979 		case GOT_IMSG_SEND_PACK_REQUEST:
980 			if (datalen != 0) {
981 				err = got_error(GOT_ERR_PRIVSEP_MSG);
982 				goto done;
983 			}
984 			/* got-send-pack is now waiting for a pack file. */
985 			done = 1;
986 			break;
987 		default:
988 			err = got_error(GOT_ERR_PRIVSEP_MSG);
989 			break;
990 		}
991 	}
992 done:
993 	free(id);
994 	free(refname);
995 	imsg_free(&imsg);
996 	return err;
997 }
998 
999 const struct got_error *
1000 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
1001 {
1002 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
1003 }
1004 
1005 const struct got_error *
1006 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
1007     int *success, char **refname, struct imsgbuf *ibuf)
1008 {
1009 	const struct got_error *err = NULL;
1010 	struct imsg imsg;
1011 	size_t datalen;
1012 	struct got_imsg_send_ref_status iref_status;
1013 
1014 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1015 	*done = 0;
1016 	*success = 0;
1017 	*refname = NULL;
1018 
1019 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1020 	if (err)
1021 		return err;
1022 
1023 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1024 	switch (imsg.hdr.type) {
1025 	case GOT_IMSG_ERROR:
1026 		if (datalen < sizeof(struct got_imsg_error)) {
1027 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1028 			break;
1029 		}
1030 		err = recv_imsg_error(&imsg, datalen);
1031 		break;
1032 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1033 		if (datalen < sizeof(*bytes_sent)) {
1034 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1035 			break;
1036 		}
1037 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1038 		break;
1039 	case GOT_IMSG_SEND_REF_STATUS:
1040 		if (datalen < sizeof(iref_status)) {
1041 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1042 			break;
1043 		}
1044 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1045 		if (datalen != sizeof(iref_status) + iref_status.name_len) {
1046 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1047 			break;
1048 		}
1049 		*success = iref_status.success;
1050 		*refname = strndup(imsg.data + sizeof(iref_status),
1051 		    iref_status.name_len);
1052 		break;
1053 	case GOT_IMSG_SEND_DONE:
1054 		if (datalen != 0) {
1055 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1056 			break;
1057 		}
1058 		*done = 1;
1059 		break;
1060 	default:
1061 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1062 		break;
1063 	}
1064 
1065 	imsg_free(&imsg);
1066 	return err;
1067 }
1068 
1069 const struct got_error *
1070 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1071     int fd)
1072 {
1073 	const struct got_error *err = NULL;
1074 
1075 	/* Keep in sync with struct got_imsg_index_pack_request */
1076 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1077 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1078 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1079 		close(fd);
1080 		return err;
1081 	}
1082 	return flush_imsg(ibuf);
1083 }
1084 
1085 const struct got_error *
1086 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1087 {
1088 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1089 }
1090 
1091 const struct got_error *
1092 got_privsep_recv_index_progress(int *done, int *nobj_total,
1093     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1094     struct imsgbuf *ibuf)
1095 {
1096 	const struct got_error *err = NULL;
1097 	struct imsg imsg;
1098 	struct got_imsg_index_pack_progress *iprogress;
1099 	size_t datalen;
1100 
1101 	*done = 0;
1102 	*nobj_total = 0;
1103 	*nobj_indexed = 0;
1104 	*nobj_resolved = 0;
1105 
1106 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1107 	if (err)
1108 		return err;
1109 
1110 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1111 	switch (imsg.hdr.type) {
1112 	case GOT_IMSG_ERROR:
1113 		if (datalen < sizeof(struct got_imsg_error)) {
1114 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1115 			break;
1116 		}
1117 		err = recv_imsg_error(&imsg, datalen);
1118 		break;
1119 	case GOT_IMSG_IDXPACK_PROGRESS:
1120 		if (datalen < sizeof(*iprogress)) {
1121 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1122 			break;
1123 		}
1124 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1125 		*nobj_total = iprogress->nobj_total;
1126 		*nobj_indexed = iprogress->nobj_indexed;
1127 		*nobj_loose = iprogress->nobj_loose;
1128 		*nobj_resolved = iprogress->nobj_resolved;
1129 		break;
1130 	case GOT_IMSG_IDXPACK_DONE:
1131 		if (datalen != 0) {
1132 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1133 			break;
1134 		}
1135 		*done = 1;
1136 		break;
1137 	default:
1138 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1139 		break;
1140 	}
1141 
1142 	imsg_free(&imsg);
1143 	return err;
1144 }
1145 
1146 const struct got_error *
1147 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1148     struct imsgbuf *ibuf)
1149 {
1150 	struct got_imsg_object *iobj;
1151 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1152 
1153 	if (datalen != sizeof(*iobj))
1154 		return got_error(GOT_ERR_PRIVSEP_LEN);
1155 	iobj = imsg->data;
1156 
1157 	*obj = calloc(1, sizeof(**obj));
1158 	if (*obj == NULL)
1159 		return got_error_from_errno("calloc");
1160 
1161 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1162 	(*obj)->type = iobj->type;
1163 	(*obj)->flags = iobj->flags;
1164 	(*obj)->hdrlen = iobj->hdrlen;
1165 	(*obj)->size = iobj->size;
1166 	/* path_packfile is handled by caller */
1167 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1168 		(*obj)->pack_offset = iobj->pack_offset;
1169 		(*obj)->pack_idx = iobj->pack_idx;
1170 	}
1171 	STAILQ_INIT(&(*obj)->deltas.entries);
1172 	return NULL;
1173 }
1174 
1175 const struct got_error *
1176 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1177 {
1178 	const struct got_error *err = NULL;
1179 	struct imsg imsg;
1180 	const size_t min_datalen =
1181 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1182 
1183 	*obj = NULL;
1184 
1185 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1186 	if (err)
1187 		return err;
1188 
1189 	switch (imsg.hdr.type) {
1190 	case GOT_IMSG_OBJECT:
1191 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1192 		break;
1193 	default:
1194 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1195 		break;
1196 	}
1197 
1198 	imsg_free(&imsg);
1199 
1200 	return err;
1201 }
1202 
1203 static const struct got_error *
1204 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1205     size_t logmsg_len)
1206 {
1207 	const struct got_error *err = NULL;
1208 	size_t offset, remain;
1209 
1210 	offset = 0;
1211 	remain = logmsg_len;
1212 	while (remain > 0) {
1213 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1214 
1215 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1216 		    commit->logmsg + offset, n) == -1) {
1217 			err = got_error_from_errno("imsg_compose "
1218 			    "COMMIT_LOGMSG");
1219 			break;
1220 		}
1221 
1222 		err = flush_imsg(ibuf);
1223 		if (err)
1224 			break;
1225 
1226 		offset += n;
1227 		remain -= n;
1228 	}
1229 
1230 	return err;
1231 }
1232 
1233 const struct got_error *
1234 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1235 {
1236 	const struct got_error *err = NULL;
1237 	struct got_imsg_commit_object *icommit;
1238 	uint8_t *buf;
1239 	size_t len, total;
1240 	struct got_object_qid *qid;
1241 	size_t author_len = strlen(commit->author);
1242 	size_t committer_len = strlen(commit->committer);
1243 	size_t logmsg_len = strlen(commit->logmsg);
1244 
1245 	total = sizeof(*icommit) + author_len + committer_len +
1246 	    commit->nparents * SHA1_DIGEST_LENGTH;
1247 
1248 	buf = malloc(total);
1249 	if (buf == NULL)
1250 		return got_error_from_errno("malloc");
1251 
1252 	icommit = (struct got_imsg_commit_object *)buf;
1253 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1254 	    sizeof(icommit->tree_id));
1255 	icommit->author_len = author_len;
1256 	icommit->author_time = commit->author_time;
1257 	icommit->author_gmtoff = commit->author_gmtoff;
1258 	icommit->committer_len = committer_len;
1259 	icommit->committer_time = commit->committer_time;
1260 	icommit->committer_gmtoff = commit->committer_gmtoff;
1261 	icommit->logmsg_len = logmsg_len;
1262 	icommit->nparents = commit->nparents;
1263 
1264 	len = sizeof(*icommit);
1265 	memcpy(buf + len, commit->author, author_len);
1266 	len += author_len;
1267 	memcpy(buf + len, commit->committer, committer_len);
1268 	len += committer_len;
1269 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1270 		memcpy(buf + len, &qid->id, SHA1_DIGEST_LENGTH);
1271 		len += SHA1_DIGEST_LENGTH;
1272 	}
1273 
1274 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1275 		err = got_error_from_errno("imsg_compose COMMIT");
1276 		goto done;
1277 	}
1278 
1279 	if (logmsg_len == 0 ||
1280 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1281 		err = flush_imsg(ibuf);
1282 		if (err)
1283 			goto done;
1284 	}
1285 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1286 done:
1287 	free(buf);
1288 	return err;
1289 }
1290 
1291 static const struct got_error *
1292 get_commit_from_imsg(struct got_commit_object **commit,
1293     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1294 {
1295 	const struct got_error *err = NULL;
1296 	struct got_imsg_commit_object *icommit;
1297 	size_t len = 0;
1298 	int i;
1299 
1300 	if (datalen < sizeof(*icommit))
1301 		return got_error(GOT_ERR_PRIVSEP_LEN);
1302 
1303 	icommit = imsg->data;
1304 	if (datalen != sizeof(*icommit) + icommit->author_len +
1305 	    icommit->committer_len +
1306 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1307 		return got_error(GOT_ERR_PRIVSEP_LEN);
1308 
1309 	if (icommit->nparents < 0)
1310 		return got_error(GOT_ERR_PRIVSEP_LEN);
1311 
1312 	len += sizeof(*icommit);
1313 
1314 	*commit = got_object_commit_alloc_partial();
1315 	if (*commit == NULL)
1316 		return got_error_from_errno(
1317 		    "got_object_commit_alloc_partial");
1318 
1319 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1320 	    SHA1_DIGEST_LENGTH);
1321 	(*commit)->author_time = icommit->author_time;
1322 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1323 	(*commit)->committer_time = icommit->committer_time;
1324 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1325 
1326 	if (icommit->author_len == 0) {
1327 		(*commit)->author = strdup("");
1328 		if ((*commit)->author == NULL) {
1329 			err = got_error_from_errno("strdup");
1330 			goto done;
1331 		}
1332 	} else {
1333 		(*commit)->author = malloc(icommit->author_len + 1);
1334 		if ((*commit)->author == NULL) {
1335 			err = got_error_from_errno("malloc");
1336 			goto done;
1337 		}
1338 		memcpy((*commit)->author, imsg->data + len,
1339 		    icommit->author_len);
1340 		(*commit)->author[icommit->author_len] = '\0';
1341 	}
1342 	len += icommit->author_len;
1343 
1344 	if (icommit->committer_len == 0) {
1345 		(*commit)->committer = strdup("");
1346 		if ((*commit)->committer == NULL) {
1347 			err = got_error_from_errno("strdup");
1348 			goto done;
1349 		}
1350 	} else {
1351 		(*commit)->committer =
1352 		    malloc(icommit->committer_len + 1);
1353 		if ((*commit)->committer == NULL) {
1354 			err = got_error_from_errno("malloc");
1355 			goto done;
1356 		}
1357 		memcpy((*commit)->committer, imsg->data + len,
1358 		    icommit->committer_len);
1359 		(*commit)->committer[icommit->committer_len] = '\0';
1360 	}
1361 	len += icommit->committer_len;
1362 
1363 	if (icommit->logmsg_len == 0) {
1364 		(*commit)->logmsg = strdup("");
1365 		if ((*commit)->logmsg == NULL) {
1366 			err = got_error_from_errno("strdup");
1367 			goto done;
1368 		}
1369 	} else {
1370 		size_t offset = 0, remain = icommit->logmsg_len;
1371 
1372 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1373 		if ((*commit)->logmsg == NULL) {
1374 			err = got_error_from_errno("malloc");
1375 			goto done;
1376 		}
1377 		while (remain > 0) {
1378 			struct imsg imsg_log;
1379 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1380 			    remain);
1381 
1382 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1383 			if (err)
1384 				goto done;
1385 
1386 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1387 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1388 				goto done;
1389 			}
1390 
1391 			memcpy((*commit)->logmsg + offset,
1392 			    imsg_log.data, n);
1393 			imsg_free(&imsg_log);
1394 			offset += n;
1395 			remain -= n;
1396 		}
1397 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1398 	}
1399 
1400 	for (i = 0; i < icommit->nparents; i++) {
1401 		struct got_object_qid *qid;
1402 
1403 		err = got_object_qid_alloc_partial(&qid);
1404 		if (err)
1405 			break;
1406 		memcpy(&qid->id, imsg->data + len +
1407 		    i * SHA1_DIGEST_LENGTH, sizeof(qid->id));
1408 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1409 		(*commit)->nparents++;
1410 	}
1411 done:
1412 	if (err) {
1413 		got_object_commit_close(*commit);
1414 		*commit = NULL;
1415 	}
1416 	return err;
1417 }
1418 
1419 const struct got_error *
1420 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1421 {
1422 	const struct got_error *err = NULL;
1423 	struct imsg imsg;
1424 	size_t datalen;
1425 	const size_t min_datalen =
1426 	    MIN(sizeof(struct got_imsg_error),
1427 	    sizeof(struct got_imsg_commit_object));
1428 
1429 	*commit = NULL;
1430 
1431 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1432 	if (err)
1433 		return err;
1434 
1435 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1436 
1437 	switch (imsg.hdr.type) {
1438 	case GOT_IMSG_COMMIT:
1439 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1440 		break;
1441 	default:
1442 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1443 		break;
1444 	}
1445 
1446 	imsg_free(&imsg);
1447 
1448 	return err;
1449 }
1450 
1451 static const struct got_error *
1452 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1453     int idx0, int idxN, size_t len)
1454 {
1455 	struct ibuf *wbuf;
1456 	struct got_imsg_tree_entries ientries;
1457 	int i;
1458 
1459 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1460 	if (wbuf == NULL)
1461 		return got_error_from_errno("imsg_create TREE_ENTRY");
1462 
1463 	ientries.nentries = idxN - idx0 + 1;
1464 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1465 		return got_error_from_errno("imsg_add TREE_ENTRY");
1466 
1467 	for (i = idx0; i <= idxN; i++) {
1468 		struct got_parsed_tree_entry *pte = &entries[i];
1469 
1470 		/* Keep in sync with struct got_imsg_tree_object definition! */
1471 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1472 			return got_error_from_errno("imsg_add TREE_ENTRY");
1473 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1474 			return got_error_from_errno("imsg_add TREE_ENTRY");
1475 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1476 			return got_error_from_errno("imsg_add TREE_ENTRY");
1477 		
1478 		/* Remaining bytes are the entry's name. */
1479 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1480 			return got_error_from_errno("imsg_add TREE_ENTRY");
1481 	}
1482 
1483 	wbuf->fd = -1;
1484 	imsg_close(ibuf, wbuf);
1485 	return NULL;
1486 }
1487 
1488 const struct got_error *
1489 got_privsep_send_tree(struct imsgbuf *ibuf,
1490     struct got_parsed_tree_entry *entries, int nentries)
1491 {
1492 	const struct got_error *err = NULL;
1493 	struct got_imsg_tree_object itree;
1494 	size_t entries_len;
1495 	int i, j;
1496 
1497 	itree.nentries = nentries;
1498 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1499 	    == -1)
1500 		return got_error_from_errno("imsg_compose TREE");
1501 
1502 	entries_len = sizeof(struct got_imsg_tree_entries);
1503 	i = 0;
1504 	for (j = 0; j < nentries; j++) {
1505 		struct got_parsed_tree_entry *pte = &entries[j];
1506 		size_t len = sizeof(*pte) + pte->namelen;
1507 
1508 		if (j > 0 &&
1509 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1510 			err = send_tree_entries(ibuf, entries,
1511 			    i, j - 1, entries_len);
1512 			if (err)
1513 				return err;
1514 			i = j;
1515 			entries_len = sizeof(struct got_imsg_tree_entries);
1516 		}
1517 
1518 		entries_len += len;
1519 	}
1520 
1521 	if (j > 0) {
1522 		err = send_tree_entries(ibuf, entries, i, j - 1, entries_len);
1523 		if (err)
1524 			return err;
1525 	}
1526 
1527 	return flush_imsg(ibuf);
1528 }
1529 
1530 const struct got_error *
1531 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1532 {
1533 	const struct got_error *err = NULL;
1534 	const size_t min_datalen =
1535 	    MIN(sizeof(struct got_imsg_error),
1536 	    sizeof(struct got_imsg_tree_object));
1537 	struct got_imsg_tree_object *itree;
1538 	size_t i;
1539 	int nentries = 0;
1540 
1541 	*tree = NULL;
1542 
1543 	err = read_imsg(ibuf);
1544 	if (err)
1545 		goto done;
1546 
1547 	for (;;) {
1548 		struct imsg imsg;
1549 		size_t n;
1550 		size_t datalen;
1551 		struct got_imsg_tree_entries *ientries;
1552 		struct got_tree_entry *te = NULL;
1553 		size_t te_offset;
1554 
1555 		n = imsg_get(ibuf, &imsg);
1556 		if (n == 0) {
1557 			if ((*tree)) {
1558 				if (nentries < (*tree)->nentries) {
1559 					err = read_imsg(ibuf);
1560 					if (err)
1561 						break;
1562 					continue;
1563 				} else
1564 					break;
1565 			} else {
1566 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1567 				break;
1568 			}
1569 		}
1570 
1571 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1572 			imsg_free(&imsg);
1573 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1574 			break;
1575 		}
1576 
1577 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1578 
1579 		switch (imsg.hdr.type) {
1580 		case GOT_IMSG_ERROR:
1581 			err = recv_imsg_error(&imsg, datalen);
1582 			break;
1583 		case GOT_IMSG_TREE:
1584 			/* This message should only appear once. */
1585 			if (*tree != NULL) {
1586 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1587 				break;
1588 			}
1589 			if (datalen != sizeof(*itree)) {
1590 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1591 				break;
1592 			}
1593 			itree = imsg.data;
1594 			if (itree->nentries < 0) {
1595 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1596 				break;
1597 			}
1598 			*tree = malloc(sizeof(**tree));
1599 			if (*tree == NULL) {
1600 				err = got_error_from_errno("malloc");
1601 				break;
1602 			}
1603 			(*tree)->entries = calloc(itree->nentries,
1604 			    sizeof(struct got_tree_entry));
1605 			if ((*tree)->entries == NULL) {
1606 				err = got_error_from_errno("malloc");
1607 				free(*tree);
1608 				*tree = NULL;
1609 				break;
1610 			}
1611 			(*tree)->nentries = itree->nentries;
1612 			(*tree)->refcnt = 0;
1613 			break;
1614 		case GOT_IMSG_TREE_ENTRIES:
1615 			/* This message should be preceeded by GOT_IMSG_TREE. */
1616 			if (*tree == NULL) {
1617 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1618 				break;
1619 			}
1620 			if (datalen <= sizeof(*ientries) ||
1621 			    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1622 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1623 				break;
1624 			}
1625 
1626 			ientries = imsg.data;
1627 			if (ientries->nentries > INT_MAX) {
1628 				err = got_error_msg(GOT_ERR_NO_SPACE,
1629 				    "too many tree entries");
1630 				break;
1631 			}
1632 			te_offset = sizeof(*ientries);
1633 			for (i = 0; i < ientries->nentries; i++) {
1634 				struct got_imsg_tree_entry ite;
1635 				const char *te_name;
1636 				uint8_t *buf = imsg.data + te_offset;
1637 
1638 				if (te_offset >= datalen) {
1639 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1640 					break;
1641 				}
1642 
1643 				/* Might not be aligned, size is ~32 bytes. */
1644 				memcpy(&ite, buf, sizeof(ite));
1645 
1646 				if (ite.namelen >= sizeof(te->name)) {
1647 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1648 					break;
1649 				}
1650 				if (te_offset + sizeof(ite) + ite.namelen >
1651 				    datalen) {
1652 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1653 					break;
1654 				}
1655 				if (nentries >= (*tree)->nentries) {
1656 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1657 					break;
1658 				}
1659 				te = &(*tree)->entries[nentries];
1660 				te_name = buf + sizeof(ite);
1661 				memcpy(te->name, te_name, ite.namelen);
1662 				te->name[ite.namelen] = '\0';
1663 				memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1664 				te->mode = ite.mode;
1665 				te->idx = nentries;
1666 				nentries++;
1667 
1668 				te_offset += sizeof(ite) + ite.namelen;
1669 			}
1670 			break;
1671 		default:
1672 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1673 			break;
1674 		}
1675 
1676 		imsg_free(&imsg);
1677 		if (err)
1678 			break;
1679 	}
1680 done:
1681 	if (*tree && (*tree)->nentries != nentries) {
1682 		if (err == NULL)
1683 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1684 		got_object_tree_close(*tree);
1685 		*tree = NULL;
1686 	}
1687 
1688 	return err;
1689 }
1690 
1691 const struct got_error *
1692 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1693     const uint8_t *data)
1694 {
1695 	struct got_imsg_blob iblob;
1696 
1697 	iblob.size = size;
1698 	iblob.hdrlen = hdrlen;
1699 
1700 	if (data) {
1701 		uint8_t *buf;
1702 
1703 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1704 			return got_error(GOT_ERR_NO_SPACE);
1705 
1706 		buf = malloc(sizeof(iblob) + size);
1707 		if (buf == NULL)
1708 			return got_error_from_errno("malloc");
1709 
1710 		memcpy(buf, &iblob, sizeof(iblob));
1711 		memcpy(buf + sizeof(iblob), data, size);
1712 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1713 		    sizeof(iblob) + size) == -1) {
1714 			free(buf);
1715 			return got_error_from_errno("imsg_compose BLOB");
1716 		}
1717 		free(buf);
1718 	} else {
1719 		/* Data has already been written to file descriptor. */
1720 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1721 		    sizeof(iblob)) == -1)
1722 			return got_error_from_errno("imsg_compose BLOB");
1723 	}
1724 
1725 
1726 	return flush_imsg(ibuf);
1727 }
1728 
1729 const struct got_error *
1730 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1731     struct imsgbuf *ibuf)
1732 {
1733 	const struct got_error *err = NULL;
1734 	struct imsg imsg;
1735 	struct got_imsg_blob *iblob;
1736 	size_t datalen;
1737 
1738 	*outbuf = NULL;
1739 
1740 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1741 	if (err)
1742 		return err;
1743 
1744 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1745 
1746 	switch (imsg.hdr.type) {
1747 	case GOT_IMSG_BLOB:
1748 		if (datalen < sizeof(*iblob)) {
1749 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1750 			break;
1751 		}
1752 		iblob = imsg.data;
1753 		*size = iblob->size;
1754 		*hdrlen = iblob->hdrlen;
1755 
1756 		if (datalen == sizeof(*iblob)) {
1757 			/* Data has been written to file descriptor. */
1758 			break;
1759 		}
1760 
1761 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1762 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1763 			break;
1764 		}
1765 
1766 		*outbuf = malloc(*size);
1767 		if (*outbuf == NULL) {
1768 			err = got_error_from_errno("malloc");
1769 			break;
1770 		}
1771 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1772 		break;
1773 	default:
1774 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1775 		break;
1776 	}
1777 
1778 	imsg_free(&imsg);
1779 
1780 	return err;
1781 }
1782 
1783 static const struct got_error *
1784 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1785 {
1786 	const struct got_error *err = NULL;
1787 	size_t offset, remain;
1788 
1789 	offset = 0;
1790 	remain = tagmsg_len;
1791 	while (remain > 0) {
1792 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1793 
1794 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1795 		    tag->tagmsg + offset, n) == -1) {
1796 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1797 			break;
1798 		}
1799 
1800 		err = flush_imsg(ibuf);
1801 		if (err)
1802 			break;
1803 
1804 		offset += n;
1805 		remain -= n;
1806 	}
1807 
1808 	return err;
1809 }
1810 
1811 const struct got_error *
1812 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1813 {
1814 	const struct got_error *err = NULL;
1815 	struct got_imsg_tag_object *itag;
1816 	uint8_t *buf;
1817 	size_t len, total;
1818 	size_t tag_len = strlen(tag->tag);
1819 	size_t tagger_len = strlen(tag->tagger);
1820 	size_t tagmsg_len = strlen(tag->tagmsg);
1821 
1822 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1823 
1824 	buf = malloc(total);
1825 	if (buf == NULL)
1826 		return got_error_from_errno("malloc");
1827 
1828 	itag = (struct got_imsg_tag_object *)buf;
1829 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1830 	itag->obj_type = tag->obj_type;
1831 	itag->tag_len = tag_len;
1832 	itag->tagger_len = tagger_len;
1833 	itag->tagger_time = tag->tagger_time;
1834 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1835 	itag->tagmsg_len = tagmsg_len;
1836 
1837 	len = sizeof(*itag);
1838 	memcpy(buf + len, tag->tag, tag_len);
1839 	len += tag_len;
1840 	memcpy(buf + len, tag->tagger, tagger_len);
1841 	len += tagger_len;
1842 
1843 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1844 		err = got_error_from_errno("imsg_compose TAG");
1845 		goto done;
1846 	}
1847 
1848 	if (tagmsg_len == 0 ||
1849 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1850 		err = flush_imsg(ibuf);
1851 		if (err)
1852 			goto done;
1853 	}
1854 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1855 done:
1856 	free(buf);
1857 	return err;
1858 }
1859 
1860 const struct got_error *
1861 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1862 {
1863 	const struct got_error *err = NULL;
1864 	struct imsg imsg;
1865 	struct got_imsg_tag_object *itag;
1866 	size_t len, datalen;
1867 	const size_t min_datalen =
1868 	    MIN(sizeof(struct got_imsg_error),
1869 	    sizeof(struct got_imsg_tag_object));
1870 
1871 	*tag = NULL;
1872 
1873 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1874 	if (err)
1875 		return err;
1876 
1877 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1878 	len = 0;
1879 
1880 	switch (imsg.hdr.type) {
1881 	case GOT_IMSG_TAG:
1882 		if (datalen < sizeof(*itag)) {
1883 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1884 			break;
1885 		}
1886 		itag = imsg.data;
1887 		if (datalen != sizeof(*itag) + itag->tag_len +
1888 		    itag->tagger_len) {
1889 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1890 			break;
1891 		}
1892 		len += sizeof(*itag);
1893 
1894 		*tag = calloc(1, sizeof(**tag));
1895 		if (*tag == NULL) {
1896 			err = got_error_from_errno("calloc");
1897 			break;
1898 		}
1899 
1900 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1901 
1902 		if (itag->tag_len == 0) {
1903 			(*tag)->tag = strdup("");
1904 			if ((*tag)->tag == NULL) {
1905 				err = got_error_from_errno("strdup");
1906 				break;
1907 			}
1908 		} else {
1909 			(*tag)->tag = malloc(itag->tag_len + 1);
1910 			if ((*tag)->tag == NULL) {
1911 				err = got_error_from_errno("malloc");
1912 				break;
1913 			}
1914 			memcpy((*tag)->tag, imsg.data + len,
1915 			    itag->tag_len);
1916 			(*tag)->tag[itag->tag_len] = '\0';
1917 		}
1918 		len += itag->tag_len;
1919 
1920 		(*tag)->obj_type = itag->obj_type;
1921 		(*tag)->tagger_time = itag->tagger_time;
1922 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1923 
1924 		if (itag->tagger_len == 0) {
1925 			(*tag)->tagger = strdup("");
1926 			if ((*tag)->tagger == NULL) {
1927 				err = got_error_from_errno("strdup");
1928 				break;
1929 			}
1930 		} else {
1931 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1932 			if ((*tag)->tagger == NULL) {
1933 				err = got_error_from_errno("malloc");
1934 				break;
1935 			}
1936 			memcpy((*tag)->tagger, imsg.data + len,
1937 			    itag->tagger_len);
1938 			(*tag)->tagger[itag->tagger_len] = '\0';
1939 		}
1940 		len += itag->tagger_len;
1941 
1942 		if (itag->tagmsg_len == 0) {
1943 			(*tag)->tagmsg = strdup("");
1944 			if ((*tag)->tagmsg == NULL) {
1945 				err = got_error_from_errno("strdup");
1946 				break;
1947 			}
1948 		} else {
1949 			size_t offset = 0, remain = itag->tagmsg_len;
1950 
1951 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1952 			if ((*tag)->tagmsg == NULL) {
1953 				err = got_error_from_errno("malloc");
1954 				break;
1955 			}
1956 			while (remain > 0) {
1957 				struct imsg imsg_log;
1958 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1959 				    remain);
1960 
1961 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1962 				if (err)
1963 					return err;
1964 
1965 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1966 					return got_error(GOT_ERR_PRIVSEP_MSG);
1967 
1968 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1969 				    n);
1970 				imsg_free(&imsg_log);
1971 				offset += n;
1972 				remain -= n;
1973 			}
1974 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1975 		}
1976 
1977 		break;
1978 	default:
1979 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1980 		break;
1981 	}
1982 
1983 	imsg_free(&imsg);
1984 
1985 	return err;
1986 }
1987 
1988 const struct got_error *
1989 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1990     struct got_packidx *packidx)
1991 {
1992 	const struct got_error *err = NULL;
1993 	struct got_imsg_packidx ipackidx;
1994 	struct got_imsg_pack ipack;
1995 	int fd;
1996 
1997 	ipackidx.len = packidx->len;
1998 	ipackidx.packfile_size = pack->filesize;
1999 	fd = dup(packidx->fd);
2000 	if (fd == -1)
2001 		return got_error_from_errno("dup");
2002 
2003 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
2004 	    sizeof(ipackidx)) == -1) {
2005 		err = got_error_from_errno("imsg_compose PACKIDX");
2006 		close(fd);
2007 		return err;
2008 	}
2009 
2010 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
2011 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
2012 		return got_error(GOT_ERR_NO_SPACE);
2013 	ipack.filesize = pack->filesize;
2014 
2015 	fd = dup(pack->fd);
2016 	if (fd == -1)
2017 		return got_error_from_errno("dup");
2018 
2019 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
2020 	    == -1) {
2021 		err = got_error_from_errno("imsg_compose PACK");
2022 		close(fd);
2023 		return err;
2024 	}
2025 
2026 	return flush_imsg(ibuf);
2027 }
2028 
2029 const struct got_error *
2030 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
2031     struct got_object_id *id)
2032 {
2033 	struct got_imsg_packed_object iobj;
2034 
2035 	iobj.idx = idx;
2036 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2037 
2038 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2039 	    &iobj, sizeof(iobj)) == -1)
2040 		return got_error_from_errno("imsg_compose "
2041 		    "PACKED_OBJECT_REQUEST");
2042 
2043 	return flush_imsg(ibuf);
2044 }
2045 
2046 const struct got_error *
2047 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2048     struct got_object_id *id)
2049 {
2050 	struct got_imsg_packed_object iobj;
2051 
2052 	iobj.idx = idx;
2053 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2054 
2055 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2056 	    &iobj, sizeof(iobj)) == -1)
2057 		return got_error_from_errno("imsg_compose "
2058 		    "PACKED_OBJECT_REQUEST");
2059 
2060 	return flush_imsg(ibuf);
2061 }
2062 
2063 const struct got_error *
2064 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2065 {
2066 	const struct got_error *err = NULL;
2067 
2068 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2069 	    NULL, 0) == -1) {
2070 		err = got_error_from_errno("imsg_compose "
2071 		    "GITCONFIG_PARSE_REQUEST");
2072 		close(fd);
2073 		return err;
2074 	}
2075 
2076 	return flush_imsg(ibuf);
2077 }
2078 
2079 const struct got_error *
2080 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2081 {
2082 	if (imsg_compose(ibuf,
2083 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2084 	    NULL, 0) == -1)
2085 		return got_error_from_errno("imsg_compose "
2086 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2087 
2088 	return flush_imsg(ibuf);
2089 }
2090 
2091 const struct got_error *
2092 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2093 {
2094 	if (imsg_compose(ibuf,
2095 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2096 	    NULL, 0) == -1)
2097 		return got_error_from_errno("imsg_compose "
2098 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2099 
2100 	return flush_imsg(ibuf);
2101 }
2102 
2103 
2104 const struct got_error *
2105 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2106 {
2107 	if (imsg_compose(ibuf,
2108 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2109 		return got_error_from_errno("imsg_compose "
2110 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2111 
2112 	return flush_imsg(ibuf);
2113 }
2114 
2115 const struct got_error *
2116 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2117 {
2118 	if (imsg_compose(ibuf,
2119 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2120 		return got_error_from_errno("imsg_compose "
2121 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2122 
2123 	return flush_imsg(ibuf);
2124 }
2125 
2126 const struct got_error *
2127 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2128 {
2129 	if (imsg_compose(ibuf,
2130 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2131 		return got_error_from_errno("imsg_compose "
2132 		    "GITCONFIG_REMOTE_REQUEST");
2133 
2134 	return flush_imsg(ibuf);
2135 }
2136 
2137 const struct got_error *
2138 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2139 {
2140 	if (imsg_compose(ibuf,
2141 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2142 		return got_error_from_errno("imsg_compose "
2143 		    "GITCONFIG_OWNER_REQUEST");
2144 
2145 	return flush_imsg(ibuf);
2146 }
2147 
2148 const struct got_error *
2149 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2150 {
2151 	const struct got_error *err = NULL;
2152 	struct imsg imsg;
2153 	size_t datalen;
2154 	const size_t min_datalen = 0;
2155 
2156 	*str = NULL;
2157 
2158 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2159 	if (err)
2160 		return err;
2161 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2162 
2163 	switch (imsg.hdr.type) {
2164 	case GOT_IMSG_GITCONFIG_STR_VAL:
2165 		if (datalen == 0)
2166 			break;
2167 		/* datalen does not include terminating \0 */
2168 		*str = malloc(datalen + 1);
2169 		if (*str == NULL) {
2170 			err = got_error_from_errno("malloc");
2171 			break;
2172 		}
2173 		memcpy(*str, imsg.data, datalen);
2174 		(*str)[datalen] = '\0';
2175 		break;
2176 	default:
2177 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2178 		break;
2179 	}
2180 
2181 	imsg_free(&imsg);
2182 	return err;
2183 }
2184 
2185 const struct got_error *
2186 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2187 {
2188 	const struct got_error *err = NULL;
2189 	struct imsg imsg;
2190 	size_t datalen;
2191 	const size_t min_datalen =
2192 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2193 
2194 	*val = 0;
2195 
2196 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2197 	if (err)
2198 		return err;
2199 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2200 
2201 	switch (imsg.hdr.type) {
2202 	case GOT_IMSG_GITCONFIG_INT_VAL:
2203 		if (datalen != sizeof(*val)) {
2204 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2205 			break;
2206 		}
2207 		memcpy(val, imsg.data, sizeof(*val));
2208 		break;
2209 	default:
2210 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2211 		break;
2212 	}
2213 
2214 	imsg_free(&imsg);
2215 	return err;
2216 }
2217 
2218 static void
2219 free_remote_data(struct got_remote_repo *remote)
2220 {
2221 	int i;
2222 
2223 	free(remote->name);
2224 	free(remote->fetch_url);
2225 	free(remote->send_url);
2226 	for (i = 0; i < remote->nfetch_branches; i++)
2227 		free(remote->fetch_branches[i]);
2228 	free(remote->fetch_branches);
2229 	for (i = 0; i < remote->nsend_branches; i++)
2230 		free(remote->send_branches[i]);
2231 	free(remote->send_branches);
2232 	for (i = 0; i < remote->nfetch_refs; i++)
2233 		free(remote->fetch_refs[i]);
2234 	free(remote->fetch_refs);
2235 }
2236 
2237 const struct got_error *
2238 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2239     int *nremotes, struct imsgbuf *ibuf)
2240 {
2241 	const struct got_error *err = NULL;
2242 	struct imsg imsg;
2243 	size_t datalen;
2244 	struct got_imsg_remotes iremotes;
2245 	struct got_imsg_remote iremote;
2246 
2247 	*remotes = NULL;
2248 	*nremotes = 0;
2249 	iremotes.nremotes = 0;
2250 
2251 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2252 	if (err)
2253 		return err;
2254 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2255 
2256 	switch (imsg.hdr.type) {
2257 	case GOT_IMSG_GITCONFIG_REMOTES:
2258 		if (datalen != sizeof(iremotes)) {
2259 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2260 			break;
2261 		}
2262 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2263 		if (iremotes.nremotes == 0) {
2264 			imsg_free(&imsg);
2265 			return NULL;
2266 		}
2267 		break;
2268 	default:
2269 		imsg_free(&imsg);
2270 		return got_error(GOT_ERR_PRIVSEP_MSG);
2271 	}
2272 
2273 	imsg_free(&imsg);
2274 
2275 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2276 	if (*remotes == NULL)
2277 		return got_error_from_errno("recallocarray");
2278 
2279 	while (*nremotes < iremotes.nremotes) {
2280 		struct got_remote_repo *remote;
2281 
2282 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2283 		if (err)
2284 			break;
2285 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2286 
2287 		switch (imsg.hdr.type) {
2288 		case GOT_IMSG_GITCONFIG_REMOTE:
2289 			remote = &(*remotes)[*nremotes];
2290 			memset(remote, 0, sizeof(*remote));
2291 			if (datalen < sizeof(iremote)) {
2292 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2293 				break;
2294 			}
2295 			memcpy(&iremote, imsg.data, sizeof(iremote));
2296 			if (iremote.name_len == 0 ||
2297 			    iremote.fetch_url_len == 0 ||
2298 			    iremote.send_url_len == 0 ||
2299 			    (sizeof(iremote) + iremote.name_len +
2300 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2301 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2302 				break;
2303 			}
2304 			remote->name = strndup(imsg.data + sizeof(iremote),
2305 			    iremote.name_len);
2306 			if (remote->name == NULL) {
2307 				err = got_error_from_errno("strndup");
2308 				break;
2309 			}
2310 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2311 			    iremote.name_len, iremote.fetch_url_len);
2312 			if (remote->fetch_url == NULL) {
2313 				err = got_error_from_errno("strndup");
2314 				free_remote_data(remote);
2315 				break;
2316 			}
2317 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2318 			    iremote.name_len + iremote.fetch_url_len,
2319 			    iremote.send_url_len);
2320 			if (remote->send_url == NULL) {
2321 				err = got_error_from_errno("strndup");
2322 				free_remote_data(remote);
2323 				break;
2324 			}
2325 			remote->mirror_references = iremote.mirror_references;
2326 			remote->fetch_all_branches = iremote.fetch_all_branches;
2327 			remote->nfetch_branches = 0;
2328 			remote->fetch_branches = NULL;
2329 			remote->nsend_branches = 0;
2330 			remote->send_branches = NULL;
2331 			remote->nfetch_refs = 0;
2332 			remote->fetch_refs = NULL;
2333 			(*nremotes)++;
2334 			break;
2335 		default:
2336 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2337 			break;
2338 		}
2339 
2340 		imsg_free(&imsg);
2341 		if (err)
2342 			break;
2343 	}
2344 
2345 	if (err) {
2346 		int i;
2347 		for (i = 0; i < *nremotes; i++)
2348 			free_remote_data(&(*remotes)[i]);
2349 		free(*remotes);
2350 		*remotes = NULL;
2351 		*nremotes = 0;
2352 	}
2353 	return err;
2354 }
2355 
2356 const struct got_error *
2357 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2358 {
2359 	const struct got_error *err = NULL;
2360 
2361 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2362 	    NULL, 0) == -1) {
2363 		err = got_error_from_errno("imsg_compose "
2364 		    "GOTCONFIG_PARSE_REQUEST");
2365 		close(fd);
2366 		return err;
2367 	}
2368 
2369 	return flush_imsg(ibuf);
2370 }
2371 
2372 const struct got_error *
2373 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2374 {
2375 	if (imsg_compose(ibuf,
2376 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2377 		return got_error_from_errno("imsg_compose "
2378 		    "GOTCONFIG_AUTHOR_REQUEST");
2379 
2380 	return flush_imsg(ibuf);
2381 }
2382 
2383 const struct got_error *
2384 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2385 {
2386 	if (imsg_compose(ibuf,
2387 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2388 		return got_error_from_errno("imsg_compose "
2389 		    "GOTCONFIG_REMOTE_REQUEST");
2390 
2391 	return flush_imsg(ibuf);
2392 }
2393 
2394 const struct got_error *
2395 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2396 {
2397 	const struct got_error *err = NULL;
2398 	struct imsg imsg;
2399 	size_t datalen;
2400 	const size_t min_datalen = 0;
2401 
2402 	*str = NULL;
2403 
2404 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2405 	if (err)
2406 		return err;
2407 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2408 
2409 	switch (imsg.hdr.type) {
2410 	case GOT_IMSG_ERROR:
2411 		if (datalen < sizeof(struct got_imsg_error)) {
2412 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2413 			break;
2414 		}
2415 		err = recv_imsg_error(&imsg, datalen);
2416 		break;
2417 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2418 		if (datalen == 0)
2419 			break;
2420 		/* datalen does not include terminating \0 */
2421 		*str = malloc(datalen + 1);
2422 		if (*str == NULL) {
2423 			err = got_error_from_errno("malloc");
2424 			break;
2425 		}
2426 		memcpy(*str, imsg.data, datalen);
2427 		(*str)[datalen] = '\0';
2428 		break;
2429 	default:
2430 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2431 		break;
2432 	}
2433 
2434 	imsg_free(&imsg);
2435 	return err;
2436 }
2437 
2438 const struct got_error *
2439 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2440     int *nremotes, struct imsgbuf *ibuf)
2441 {
2442 	const struct got_error *err = NULL;
2443 	struct imsg imsg;
2444 	size_t datalen;
2445 	struct got_imsg_remotes iremotes;
2446 	struct got_imsg_remote iremote;
2447 	const size_t min_datalen =
2448 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2449 
2450 	*remotes = NULL;
2451 	*nremotes = 0;
2452 	iremotes.nremotes = 0;
2453 
2454 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2455 	if (err)
2456 		return err;
2457 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2458 
2459 	switch (imsg.hdr.type) {
2460 	case GOT_IMSG_ERROR:
2461 		if (datalen < sizeof(struct got_imsg_error)) {
2462 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2463 			break;
2464 		}
2465 		err = recv_imsg_error(&imsg, datalen);
2466 		break;
2467 	case GOT_IMSG_GOTCONFIG_REMOTES:
2468 		if (datalen != sizeof(iremotes)) {
2469 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2470 			break;
2471 		}
2472 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2473 		if (iremotes.nremotes == 0) {
2474 			imsg_free(&imsg);
2475 			return NULL;
2476 		}
2477 		break;
2478 	default:
2479 		imsg_free(&imsg);
2480 		return got_error(GOT_ERR_PRIVSEP_MSG);
2481 	}
2482 
2483 	imsg_free(&imsg);
2484 
2485 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2486 	if (*remotes == NULL)
2487 		return got_error_from_errno("recallocarray");
2488 
2489 	while (*nremotes < iremotes.nremotes) {
2490 		struct got_remote_repo *remote;
2491 		const size_t min_datalen =
2492 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2493 		int i;
2494 
2495 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2496 		if (err)
2497 			break;
2498 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2499 
2500 		switch (imsg.hdr.type) {
2501 		case GOT_IMSG_ERROR:
2502 			if (datalen < sizeof(struct got_imsg_error)) {
2503 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2504 				break;
2505 			}
2506 			err = recv_imsg_error(&imsg, datalen);
2507 			break;
2508 		case GOT_IMSG_GOTCONFIG_REMOTE:
2509 			remote = &(*remotes)[*nremotes];
2510 			memset(remote, 0, sizeof(*remote));
2511 			if (datalen < sizeof(iremote)) {
2512 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2513 				break;
2514 			}
2515 			memcpy(&iremote, imsg.data, sizeof(iremote));
2516 			if (iremote.name_len == 0 ||
2517 			    (iremote.fetch_url_len == 0 &&
2518 			    iremote.send_url_len == 0) ||
2519 			    (sizeof(iremote) + iremote.name_len +
2520 			    iremote.fetch_url_len + iremote.send_url_len) >
2521 			    datalen) {
2522 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2523 				break;
2524 			}
2525 			remote->name = strndup(imsg.data + sizeof(iremote),
2526 			    iremote.name_len);
2527 			if (remote->name == NULL) {
2528 				err = got_error_from_errno("strndup");
2529 				break;
2530 			}
2531 			remote->fetch_url = strndup(imsg.data +
2532 			    sizeof(iremote) + iremote.name_len,
2533 			    iremote.fetch_url_len);
2534 			if (remote->fetch_url == NULL) {
2535 				err = got_error_from_errno("strndup");
2536 				free_remote_data(remote);
2537 				break;
2538 			}
2539 			remote->send_url = strndup(imsg.data +
2540 			    sizeof(iremote) + iremote.name_len +
2541 			    iremote.fetch_url_len, iremote.send_url_len);
2542 			if (remote->send_url == NULL) {
2543 				err = got_error_from_errno("strndup");
2544 				free_remote_data(remote);
2545 				break;
2546 			}
2547 			remote->mirror_references = iremote.mirror_references;
2548 			remote->fetch_all_branches = iremote.fetch_all_branches;
2549 			if (iremote.nfetch_branches > 0) {
2550 				remote->fetch_branches = recallocarray(NULL, 0,
2551 				    iremote.nfetch_branches, sizeof(char *));
2552 				if (remote->fetch_branches == NULL) {
2553 					err = got_error_from_errno("calloc");
2554 					free_remote_data(remote);
2555 					break;
2556 				}
2557 			}
2558 			remote->nfetch_branches = 0;
2559 			for (i = 0; i < iremote.nfetch_branches; i++) {
2560 				char *branch;
2561 				err = got_privsep_recv_gotconfig_str(&branch,
2562 				    ibuf);
2563 				if (err) {
2564 					free_remote_data(remote);
2565 					goto done;
2566 				}
2567 				remote->fetch_branches[i] = branch;
2568 				remote->nfetch_branches++;
2569 			}
2570 			if (iremote.nsend_branches > 0) {
2571 				remote->send_branches = recallocarray(NULL, 0,
2572 				    iremote.nsend_branches, sizeof(char *));
2573 				if (remote->send_branches == NULL) {
2574 					err = got_error_from_errno("calloc");
2575 					free_remote_data(remote);
2576 					break;
2577 				}
2578 			}
2579 			remote->nsend_branches = 0;
2580 			for (i = 0; i < iremote.nsend_branches; i++) {
2581 				char *branch;
2582 				err = got_privsep_recv_gotconfig_str(&branch,
2583 				    ibuf);
2584 				if (err) {
2585 					free_remote_data(remote);
2586 					goto done;
2587 				}
2588 				remote->send_branches[i] = branch;
2589 				remote->nsend_branches++;
2590 			}
2591 			if (iremote.nfetch_refs > 0) {
2592 				remote->fetch_refs = recallocarray(NULL, 0,
2593 				    iremote.nfetch_refs, sizeof(char *));
2594 				if (remote->fetch_refs == NULL) {
2595 					err = got_error_from_errno("calloc");
2596 					free_remote_data(remote);
2597 					break;
2598 				}
2599 			}
2600 			remote->nfetch_refs = 0;
2601 			for (i = 0; i < iremote.nfetch_refs; i++) {
2602 				char *ref;
2603 				err = got_privsep_recv_gotconfig_str(&ref,
2604 				    ibuf);
2605 				if (err) {
2606 					free_remote_data(remote);
2607 					goto done;
2608 				}
2609 				remote->fetch_refs[i] = ref;
2610 				remote->nfetch_refs++;
2611 			}
2612 			(*nremotes)++;
2613 			break;
2614 		default:
2615 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2616 			break;
2617 		}
2618 
2619 		imsg_free(&imsg);
2620 		if (err)
2621 			break;
2622 	}
2623 done:
2624 	if (err) {
2625 		int i;
2626 		for (i = 0; i < *nremotes; i++)
2627 			free_remote_data(&(*remotes)[i]);
2628 		free(*remotes);
2629 		*remotes = NULL;
2630 		*nremotes = 0;
2631 	}
2632 	return err;
2633 }
2634 
2635 const struct got_error *
2636 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2637     struct got_object_id *id, int idx, const char *path)
2638 {
2639 	struct ibuf *wbuf;
2640 	size_t path_len = strlen(path) + 1;
2641 
2642 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2643 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2644 	if (wbuf == NULL)
2645 		return got_error_from_errno(
2646 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2647 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2648 		return got_error_from_errno("imsg_add "
2649 		    "COMMIT_TRAVERSAL_REQUEST");
2650 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2651 		return got_error_from_errno("imsg_add "
2652 		    "COMMIT_TRAVERSAL_REQUEST");
2653 	if (imsg_add(wbuf, path, path_len) == -1)
2654 		return got_error_from_errno("imsg_add "
2655 		    "COMMIT_TRAVERSAL_REQUEST");
2656 
2657 	wbuf->fd = -1;
2658 	imsg_close(ibuf, wbuf);
2659 
2660 	return flush_imsg(ibuf);
2661 }
2662 
2663 const struct got_error *
2664 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2665     struct got_object_id **changed_commit_id,
2666     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2667 {
2668 	const struct got_error *err = NULL;
2669 	struct imsg imsg;
2670 	struct got_imsg_traversed_commits *icommits;
2671 	size_t datalen;
2672 	int i, done = 0;
2673 
2674 	*changed_commit = NULL;
2675 	*changed_commit_id = NULL;
2676 
2677 	while (!done) {
2678 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2679 		if (err)
2680 			return err;
2681 
2682 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2683 		switch (imsg.hdr.type) {
2684 		case GOT_IMSG_TRAVERSED_COMMITS:
2685 			icommits = imsg.data;
2686 			if (datalen != sizeof(*icommits) +
2687 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2688 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2689 				break;
2690 			}
2691 			for (i = 0; i < icommits->ncommits; i++) {
2692 				struct got_object_qid *qid;
2693 				uint8_t *sha1 = (uint8_t *)imsg.data +
2694 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2695 				err = got_object_qid_alloc_partial(&qid);
2696 				if (err)
2697 					break;
2698 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2699 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2700 
2701 				/* The last commit may contain a change. */
2702 				if (i == icommits->ncommits - 1) {
2703 					*changed_commit_id =
2704 					    got_object_id_dup(&qid->id);
2705 					if (*changed_commit_id == NULL) {
2706 						err = got_error_from_errno(
2707 						    "got_object_id_dup");
2708 						break;
2709 					}
2710 				}
2711 			}
2712 			break;
2713 		case GOT_IMSG_COMMIT:
2714 			if (*changed_commit_id == NULL) {
2715 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2716 				break;
2717 			}
2718 			err = get_commit_from_imsg(changed_commit, &imsg,
2719 			    datalen, ibuf);
2720 			break;
2721 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2722 			done = 1;
2723 			break;
2724 		default:
2725 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2726 			break;
2727 		}
2728 
2729 		imsg_free(&imsg);
2730 		if (err)
2731 			break;
2732 	}
2733 
2734 	if (err)
2735 		got_object_id_queue_free(commit_ids);
2736 	return err;
2737 }
2738 
2739 const struct got_error *
2740 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2741     struct got_object_id *id)
2742 {
2743 	struct got_imsg_raw_delta_request dreq;
2744 
2745 	dreq.idx = idx;
2746 	memcpy(dreq.id, id->sha1, SHA1_DIGEST_LENGTH);
2747 
2748 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
2749 	    &dreq, sizeof(dreq)) == -1)
2750 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
2751 
2752 	return flush_imsg(ibuf);
2753 }
2754 
2755 const struct got_error *
2756 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
2757 {
2758 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
2759 }
2760 
2761 const struct got_error *
2762 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
2763     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
2764     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
2765 {
2766 	struct got_imsg_raw_delta idelta;
2767 	int ret;
2768 
2769 	idelta.base_size = base_size;
2770 	idelta.result_size = result_size;
2771 	idelta.delta_size = delta_size;
2772 	idelta.delta_compressed_size = delta_compressed_size;
2773 	idelta.delta_offset = delta_offset;
2774 	idelta.delta_out_offset = delta_out_offset;
2775 	memcpy(idelta.base_id, base_id->sha1, SHA1_DIGEST_LENGTH);
2776 
2777 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
2778 	    &idelta, sizeof(idelta));
2779 	if (ret == -1)
2780 		return got_error_from_errno("imsg_compose RAW_DELTA");
2781 
2782 	return flush_imsg(ibuf);
2783 }
2784 
2785 const struct got_error *
2786 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
2787     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
2788     off_t *delta_out_offset, struct got_object_id **base_id, struct imsgbuf *ibuf)
2789 {
2790 	const struct got_error *err = NULL;
2791 	struct imsg imsg;
2792 	struct got_imsg_raw_delta *delta;
2793 	size_t datalen;
2794 
2795 	*base_size = 0;
2796 	*result_size = 0;
2797 	*delta_size = 0;
2798 	*delta_compressed_size = 0;
2799 	*delta_offset = 0;
2800 	*delta_out_offset = 0;
2801 	*base_id = NULL;
2802 
2803 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2804 	if (err)
2805 		return err;
2806 
2807 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2808 
2809 	switch (imsg.hdr.type) {
2810 	case GOT_IMSG_RAW_DELTA:
2811 		if (datalen != sizeof(*delta)) {
2812 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2813 			break;
2814 		}
2815 		delta = imsg.data;
2816 		*base_size = delta->base_size;
2817 		*result_size = delta->result_size;
2818 		*delta_size = delta->delta_size;
2819 		*delta_compressed_size = delta->delta_compressed_size;
2820 		*delta_offset = delta->delta_offset;
2821 		*delta_out_offset = delta->delta_out_offset;
2822 		*base_id = calloc(1, sizeof(**base_id));
2823 		if (*base_id == NULL) {
2824 			err = got_error_from_errno("malloc");
2825 			break;
2826 		}
2827 		memcpy((*base_id)->sha1, delta->base_id, SHA1_DIGEST_LENGTH);
2828 		break;
2829 	default:
2830 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2831 		break;
2832 	}
2833 
2834 	imsg_free(&imsg);
2835 
2836 	if (err) {
2837 		free(*base_id);
2838 		*base_id = NULL;
2839 	}
2840 	return err;
2841 }
2842 
2843 const struct got_error *
2844 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
2845     struct got_object_id **ids, size_t nids)
2846 {
2847 	const struct got_error *err = NULL;
2848 	struct got_imsg_object_idlist idlist;
2849 	struct ibuf *wbuf;
2850 	size_t i;
2851 
2852 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
2853 		return got_error(GOT_ERR_NO_SPACE);
2854 
2855 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
2856 	    sizeof(idlist) + nids * sizeof(**ids));
2857 	if (wbuf == NULL) {
2858 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
2859 		return err;
2860 	}
2861 
2862 	idlist.nids = nids;
2863 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
2864 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
2865 
2866 	for (i = 0; i < nids; i++) {
2867 		struct got_object_id *id = ids[i];
2868 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
2869 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
2870 	}
2871 	
2872 	wbuf->fd = -1;
2873 	imsg_close(ibuf, wbuf);
2874 
2875 	return flush_imsg(ibuf);
2876 }
2877 
2878 const struct got_error *
2879 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
2880 {
2881 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
2882 	    == -1)
2883 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
2884 
2885 	return flush_imsg(ibuf);
2886 }
2887 
2888 const struct got_error *
2889 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
2890     size_t *nids, struct imsgbuf *ibuf)
2891 {
2892 	const struct got_error *err = NULL;
2893 	struct imsg imsg;
2894 	struct got_imsg_object_idlist *idlist;
2895 	size_t datalen;
2896 
2897 	*ids = NULL;
2898 	*done = 0;
2899 	*nids = 0;
2900 
2901 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2902 	if (err)
2903 		return err;
2904 
2905 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2906 	switch (imsg.hdr.type) {
2907 	case GOT_IMSG_OBJ_ID_LIST:
2908 		if (datalen < sizeof(*idlist)) {
2909 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2910 			break;
2911 		}
2912 		idlist = imsg.data;
2913 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
2914 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2915 			break;
2916 		}
2917 		*nids = idlist->nids;
2918 		*ids = calloc(*nids, sizeof(**ids));
2919 		if (*ids == NULL) {
2920 			err = got_error_from_errno("calloc");
2921 			break;
2922 		}
2923 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(idlist),
2924 		    *nids * sizeof(**ids));
2925 		break;
2926 	case GOT_IMSG_OBJ_ID_LIST_DONE:
2927 		*done = 1;
2928 		break;
2929 	default:
2930 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2931 		break;
2932 	}
2933 
2934 	imsg_free(&imsg);
2935 
2936 	return err;
2937 }
2938 
2939 const struct got_error *
2940 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
2941 {
2942 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
2943 	    == -1)
2944 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
2945 
2946 	return flush_imsg(ibuf);
2947 }
2948 
2949 const struct got_error *
2950 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
2951     struct got_imsg_reused_delta *deltas, size_t ndeltas)
2952 {
2953 	const struct got_error *err = NULL;
2954 	struct ibuf *wbuf;
2955 	struct got_imsg_reused_deltas ideltas;
2956 	size_t i;
2957 
2958 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
2959 		return got_error(GOT_ERR_NO_SPACE);
2960 
2961 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
2962 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
2963 	if (wbuf == NULL) {
2964 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
2965 		return err;
2966 	}
2967 
2968 	ideltas.ndeltas = ndeltas;
2969 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
2970 		return got_error_from_errno("imsg_add REUSED_DELTAS");
2971 
2972 	for (i = 0; i < ndeltas; i++) {
2973 		struct got_imsg_reused_delta *delta = &deltas[i];
2974 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
2975 			return got_error_from_errno("imsg_add REUSED_DELTAS");
2976 	}
2977 	
2978 	wbuf->fd = -1;
2979 	imsg_close(ibuf, wbuf);
2980 
2981 	return flush_imsg(ibuf);
2982 }
2983 
2984 const struct got_error *
2985 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
2986 {
2987 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
2988 	    == -1)
2989 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
2990 
2991 	return flush_imsg(ibuf);
2992 }
2993 
2994 const struct got_error *
2995 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
2996     size_t *ndeltas, struct imsgbuf *ibuf)
2997 {
2998 	const struct got_error *err = NULL;
2999 	struct imsg imsg;
3000 	struct got_imsg_reused_deltas *ideltas;
3001 	size_t datalen;
3002 
3003 	*done = 0;
3004 	*ndeltas = 0;
3005 
3006 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3007 	if (err)
3008 		return err;
3009 
3010 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3011 	switch (imsg.hdr.type) {
3012 	case GOT_IMSG_REUSED_DELTAS:
3013 		if (datalen < sizeof(*ideltas)) {
3014 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3015 			break;
3016 		}
3017 		ideltas = imsg.data;
3018 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
3019 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3020 			break;
3021 		}
3022 		*ndeltas = ideltas->ndeltas;
3023 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(ideltas),
3024 		    *ndeltas * sizeof(*deltas));
3025 		break;
3026 	case GOT_IMSG_DELTA_REUSE_DONE:
3027 		*done = 1;
3028 		break;
3029 	default:
3030 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3031 		break;
3032 	}
3033 
3034 	imsg_free(&imsg);
3035 
3036 	return err;
3037 }
3038 
3039 const struct got_error *
3040 got_privsep_unveil_exec_helpers(void)
3041 {
3042 	const char *helpers[] = {
3043 	    GOT_PATH_PROG_READ_PACK,
3044 	    GOT_PATH_PROG_READ_OBJECT,
3045 	    GOT_PATH_PROG_READ_COMMIT,
3046 	    GOT_PATH_PROG_READ_TREE,
3047 	    GOT_PATH_PROG_READ_BLOB,
3048 	    GOT_PATH_PROG_READ_TAG,
3049 	    GOT_PATH_PROG_READ_GITCONFIG,
3050 	    GOT_PATH_PROG_READ_GOTCONFIG,
3051 	    GOT_PATH_PROG_READ_PATCH,
3052 	    GOT_PATH_PROG_FETCH_PACK,
3053 	    GOT_PATH_PROG_INDEX_PACK,
3054 	    GOT_PATH_PROG_SEND_PACK,
3055 	};
3056 	size_t i;
3057 
3058 	for (i = 0; i < nitems(helpers); i++) {
3059 		if (unveil(helpers[i], "x") == 0)
3060 			continue;
3061 		return got_error_from_errno2("unveil", helpers[i]);
3062 	}
3063 
3064 	return NULL;
3065 }
3066 
3067 void
3068 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3069 {
3070 	if (close(imsg_fds[0]) == -1) {
3071 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3072 		_exit(1);
3073 	}
3074 
3075 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3076 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3077 		_exit(1);
3078 	}
3079 
3080 	closefrom(GOT_IMSG_FD_CHILD + 1);
3081 
3082 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3083 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3084 		    strerror(errno));
3085 		_exit(1);
3086 	}
3087 }